Coil winding machine



Jan. 4, 1966 M. L WEIGEL COIL WINDING MACHINE Original Filed March 26, 1959 I M544.- 147'70? E Y5 INVENTOR. M012 TQA/ L. Q

efima mm 10 Sheets-Sheet 1 K MAM MJW Jan. 4, 1966 M. L. WEIGEL COIL WINDING MACHINE Original Filed March 26, 1959 1Q Sheets-Sheet 2 4 R 4 m ,WM s Z w. 4 MW 7 n T 4 Mom-0M L. I'VE/GEL BY Jan. 4, 1966 M. L. WEIGEL COIL WINDING MACHINE 1O Sheets-Sheet 5 INVENTOR. .MoRToA/ L. WE/GEL +2 BY 777M072, A oefi'manm, (flzhmam/ 7194 Original Filed March 26, 1959 ATTORNEYS. I

Jan. 4, 1966 M. L. wEl GEL con; WINDING MACHINE Original Filed March 26, 1959 10 Sheets-Sheet 4 IN VENTOK MoRTo/J L. WE/GEL BY 744011, file/madman, Kai/Mun and Wyu.

I47'TORA/EYS.

Jan. 4, 1966 wElGEL 3,227,193

COIL WINDING MACHINE Original Filed March 26, 1959 1Q sheets-Sheet 5 50 ikgzz INVENTOR.

MoPTo/J L. WE/gE-l. BY

14 T'TOEA/E Ys.

Jan. 4, 1966 M. L. WEIGEL 3,227,193

con. WINDING MACHINE Original Filed March 26, 1959 10 Sheets-Sheet 6 INVENTOR. MORTOA/ L WE/GEL BY 77/614011, A ole%mamen, 611M211 411a M414,

Jan. 4, 1966 M. L. WEIGEL COIL WINDING MACHINE 1O Sheets-Sheet 7 Original Filed March 26, 1959 INVENTOR. Mo/zrcm/ L. WE/GE-L BY 27am, fiMmnm, @zflhmam/ 7 1 544 ATTOEA/E'YS.

Jan. 4, 1966 M. L. WElGEL COIL WINDING MACHINE Original Filed March 26, 1959 Jan. 4, 1966 M. L. WEIGEL COIL WINDING MACHINE Original Filed March 26, 1959 10 Sheets-Sheet 10 NOV 'mawn, KvZe/Lmanm, when and Wgu United States Pat O F The present invention-relates to coil winding apparatus and more particularly .to apparatus for automatically manufacturing .multiple .coil inductance units ,such, for example, as those employed .in the VHF television tuner describedin application S erial No. 7 08,594.Krepps et al., filed January -13, 1958, now abandoned and the [continuation of said abandonedapplication serial No. 120,- 440, filed June 28, 1961. Specifically, this applicatio n is a continua'tion of my,prior;application SeriallNo. 802,221, filecLMarch 26,;195 9 now abandoned. Alhth-reeofthese applications are assigned to the same a Si Pce as the present invention. r

.In the past, .VHF television ,tunershayebeen primarily of either the .switch type in which a-plurality: of incremental inductance u'nits fixedly mounted in the tuner are selectively connected by aplurality of vganged switches into the various ,tunedacircuits ofthe ftuner, or of.tl1e turret type in.=,which a plurality of inductan'ce elements are mounted on -a rotatable turret and are selectively moved into the various, tuned. circuits, of the tuner. Each of these tuners have certain advantages and disadvantages relative to ,the other but prior to thepresentinvention an important drawback of theturret type tunerhas been the complexity of the individualinductance elements and the resultant .hig-h manufacturing cost thereof. .As .is pointed outin the heretoforementiqned applications, Serial No. 703,594,.and Serial No. 120,440, itris desirableto provide-a tuner of, the, turret type whichincorporates a. single multiple inductanceunitfor each.,channel to be received, and it is further desirable to. employ a multiple inductance -,unit which is adaptable to automatic assembly techniques. -By.providing ,a multiple inductance unit havingthis vattribute, -the manufacturing cost andthe reliability. ofoperation' of the overall tuner can. be so greatly improved as to 3 provide .a turret. type tuner which ,isat .least as reliable in operation and less expensive to manufacture than present-day switch type tuners having the same operating characteristics.

:lnorder to. derive the maximum advantage from. using a multiple inductance unitof the typereferred to above, it would be desirable to provide assembly apparatuswhich automatically -winds a plurality of coilsjon .a single insulating core, and which additionally .perforrns the other functions required to completely.an'dautomatically manu facture a: finished multiple inductance unit which is ready for-mounting in the turret of a tuner. Fur-thermore,.inasmueh.asfautomatic assemblyapparatus of this type is expensive, itisdesirable that such machinery operate at very high speeds so as to reduce the number of such machines required to supporta given assembly line operation, and, in addition, it is important thatsuch machinery be both precise and reliable in operation so as to insure the production of a maximum number ofquality units.

Therefore, an object of the present invention is to proapparatus for automatically manufaeturing multiple inductance units .of the type disclqsd the above-identified applications, Serial No. 708,594 and Seri aI No. 120,440.

A still further object of the present invention .is to provide lliOmatic assembly apparatus for winding afplurality of different coils on a core and for soldering" the terminal portions of the coils'to terminal luded th c ,Bri'efly, the above and further objects are realized accordance with the present inventionby providingautoo'f 'FlG. 7 assuming' the matic assem'bly apparatusto which coil forms-'liavin erminals previously mounted thereon are'individually .supplied nnd which thereafter winds a plurality "of 'coi-lson the .fQirns .betweenjthe terminals, solders the terminal portions of the coils to the terminal mem ers; and removes anyundesired intereonnecting.pQ-rtions of the wire. 7 The invention, "both as to, its organization and method of operation, together with further 'objectsandadvantages thereof, will best :beu'nderstood by ,referenceito theltolaccompanying drawings, in which lowing detailed description taken in connection with the- FIG. .1, "a fronteleyatipnal' view ofa coil winding machine embodying the present invention, twain portio'ns o f the machine being broken away;

. BIG. 2 is a plan .view of the coil winding machine shownin Fig.1;

3 is a sectionalviewftaken alpng theline 33 of EIG'I;

FIG. fl is a sectional view taken alongthe line of 1316.,3 assuming the entire machine, to be shown nhe e- G: i S tiona V ew, tal ren along the line .5--5 of FIG. 1;

EIGQG is ahsectional view. taken along the line.

r in E16. 7 .isasectiQnal View. taken alongthe line 7-:7 of

FIG. ,8 is a sectionalviewtakenalong the line818 assuming the entire .inachine to be shown therein;

FIG. 9 is a sectional view taken along the linef9 ,9 .of V M 2 r FIG. 10. isasectionalview taken along the-line mflfl ims F IG. 11 is 'a s ectionalviewtaken along .the,line.1 1-,- ,1;1 of BIG. 3 assumingtheentire machine tobes'hciwn there 1n;

FIG. 12isa sectional view taken alonguthe line. 1 2..1 2- of. BIG. assuming theentire. machine to. be. shown there- FIG. 13 is a .sectionaLview, showing the,mannerin therein;

l FIG. 18 is a sectional view taken along the line 1 8-18 of FIG. 17;

FIG. 19 is a viewshowing themanner in which acoil form is mounted in the machine of FIG. 1;

FIG. 20 is a partial view ot the machine showing .a

a e et ea- 4, 1. .6.

entire machine 'toQbe shown coil form with a coil partially wound thereon during the winding operation;

FIG. 21 is a sectional view of the solder pot showing the manner it is moved into a soldering position during the operation of the machine;

FIG. 22 is a fragmentary view of a portion of the machine of FIG. 1 showing the manner in which the guillotine operates to sever certain portions of the wire from the coils wound on the coil form;

FIG. 23 is a fragmentary view illustrating the manner in which the wire from the wound unit is separated from the winding spool;

FIG. 24 is a perspective view of a multiple inductance unit as manufactured by the machine in the present invention; and

FIG. 25 is a schematic diagram of the control circuit of the winding machine of FIG. 1.

Referring now to the drawings, and particularly to FIG. 24 thereof, there is shown a multiple inductance unit of the type manufactured by a machine embodying the present invention. It comprises as its principal components an elongated coil form or stick 101 which is square in cross section and formed of a suitable insulating material such as, for example, a low dielectric loss ceramic. A plurality of terminal members 102, 103, 104, 105, 106, 107, 108, and 109 extend through the form and are provided with bifurcated solder lugs 102a, 103a, 104a, 105a, 106a, 107a, 108a and 109a at one end and rounded switching contacts at the other end. As shown, four inductance coils 110, 111, 112, and 113 are wound on the coil form 101 and connected to the solder lugs on the terminal members 102. As best illustrated in FIG. 21, the bottom edge of the notch formed by the bifurcations in each of the solder lugs 102a to 109a, inclusive, is spaced from the adjacent surface of the coil form 101 and the end portions of the inductance coils 110 to 113, inclusive, are positioned within these notches so that they are spaced from the coil form 101. As shown, the coils 110 and 113 are separated from the other coils, each of them thus necessitates two terminal members, but the coils 111 and 112 are connected together at the terminal member 105. In order to enable adjustment of a core (not shown) within the oscillator coil 110 thereby to adjust the frequency of the associated oscillator, one end of the coil form 101 is offset from the principal longitudinal axis thereof and the terminal 102 is mounted in the offset portion.

Referring now to FIGS. 1 and 2, there is shown a machine which may be used for automatically assem bling the multiple inductance units 100. The machine 120 comprises a bed 122 which is formed by a pair of channel members 122a and 12% disposed in face-to-face relationship and tied together at their ends by suitable cross braces 1220, and a pair of uprights 123 and 124 which are mounted on the channels 122a and 122k and held together at the top of a plate 125 which lies across the upper ends of the uprights 123 and 124.

In order to support a coil form in the machine 120 during the assembly operation, there is provided a headstock collet 127, which is suitably journaled by means of a ball bearing assembly 128 in an aperture 129 in the upright 123, and a tailstock collet 132 which is suitably journaled by means of a ball bearing assembly 133 in an aperture 134 in an auxiliary upright 135 which is mounted on the channels 122a and 1221) between the principal uprights 123 and 124. As best shown in FIG. 3, the collet 127 has a generally rectangular recess 127a in the face thereof for reception of one end of the coil form, and the face of the collet 132 is provided with a face 132a of substantially the same shape for receiving the other end of the coil form. Placing of the coil forms in the collets is facilitated by tapered walls 127!) and 132k thereof which partially define the recesses 127a and 132a in the respective collets.

In order to hold the coil form in the machine, the collets 127 and 132 are resiliently biased toward one another to apply an axial compressive force on the coil form, and to this end the tailstock collet 132, as best shown in FIGS. 4 and 6, is mounted in a cylindrical bore 137 of a tailstock drive shaft 136 and the collet 132 is urged toward the collet 127 by a coil spring 138 positioned between the bottom 139 of the hole 137 and the rear end of the collet 132. Axial movement of the collet 132 is limited by a pin 143 which is fastened at its ends in the tailstock drive shaft 136 and which extends through a slot 142 in the collet 132.

It is important that the coil form have a low dielectric loss, and therefore, it is preferably molded of a ceramic material which, at the present time, is necessarily quite brittle, and in order to prevent cracking of the coil form during the winding operation when the coil form is rotatecl, the headstock and tailstock collets 127 and 132 are driven simultaneously. Accordingly, the collet 127 is directly connected to a drive shaft 145, which, as best shown in FIG. 7, is connected by a pulley 146 and a belt 147 to a drive motor 207. A sprocket a is mounted on the end of the drive shaft 145 and is connected by means of a suitable link chain 148 to a sprocket 149 fastened to the end of an idler shaft 150 which is suitably journaled at its ends in bearings 151 and 152 mounted on the cross brace 125 directly above the uprights 123 and 124, respectively. A sprocket 154 is mounted on the other end of the shaft 150 and is connected by means of a chain 155 to a sprocket 156 mounted near the end of the tailstock drive shaft 136. Consequently, as the output shaft 145 rotates, the collets 127 and 132 rotate in unison thereby to minimize the shear stress exerted on the coil form during the winding operation.

Referring now to FIGS. 2, 3, and 6, the wire with which the coils are wound is supplied to the coil form by means of a wire feed carriage assembly 160 which is driven by the motor 207 along the length of the coil form. The assembly 160 comprises a support plate 162 on which an angulated wire guide tube 163 is mounted and which is fixedly secured to an apertured block 165. The block 165 is fixedly attached to a drive rod 166 which is suitably journaled for axial movement in the uprights 123 and 124. As best shown in FIG. 6, the rod 166 is mounted in a bushing 168a which is press-fitted into a suitable aperture in the upright 123 and a similar arrangement is provided in the upright 124 for supporting the other end of the rod 166. The carriage 160 further includes a guide bracket 168 which is fixedly secured to the block 165 and which depends therefrom for sliding engagement with the forward face of the channel 122a to guide the carriage 160 as it moves across the coil form. In addition, a guide rod or tie bar 171 is secured between the uprights 123 and 124 in parallel relationship with the headstock and tailstock collets 127 and 132, thereby to provide an additional guide surface across which the carriage 160 moves during the winding operation.

The wire to be wound on the coil form is supplied from a spool 174, best shown in FIG. 13, which is journaled in a bar 175 depending from the channel member 122a and is prevented from freely rotating by means of a spring 176, and friction bar 176a, see FIG. 14, thereby to maintain the wire taut during the winding of the coils. Referring to FIG. 15, it may be seen that the wire from the spool 174 is fed counterclockwise over a pulley 177 which is journaled on the bracket 168, clockwise over a pulley 178 which is rotatably mounted on the forward end of the support plate 162, and through a manual wire advance mechanism 179 to the guide tube 163. The advance mechanism 179 comprises a generally cylindrical pinch. roller 180, best shown in FIG. 16, and an annularly grooved drive roller 181. The pinch roller 180 is journaled in a support block 182 which is slidably mounted on a pair or headed uide pins 183 and 184 far have: ment perpendicular to the principal axis ofthedrive roller 181. A pair of springs 188 and 1 8 9 which are frespectively mounted between the h'eadsof the pins 183 and 184 and the block 182 resiliently bias the roller 180 toward the roller 18 1, thereby to pinch the wire therebetween; Manual operation of the advance mechanism 179 is effected by rot-atiiig a knob 1 92 which is mounted on the end of a shaft 190 to which the roller 181 is attached. The "shaft 190 =jour naled in a bearing 1-91 mounted on thebotto'm of the plate 162.

At the start of an assembly operationthe "carriage assembly 'flltiti'is in the extreineleft hand position shown in FIG. '-1 aiid tiie end ofth'e guide tube 1'63 is alignedwith a groove 196 formed in the ta'ce o'f the Genet 127 so that whentheknob l9'2 is rotatedfwire is fedinto-the groove 195. I ln-order tofa'ssiire 'that thewire 'to be fed is aligned with "the groove 1%, a bushing 198Lh'aving an internal diameter but slightly greater than the external diameter of thewire is rrioiiiited .i'n -the endof the guide 'tube 163, and thein'he'rend 198a df'the bushing 198 iscorii-caliso as 't'o g'iiide tlieend "of the wire into the bushing when the wire is initially threaded through the guidetube 163.

In FIG. 15 the Wire is shown after it has been fedthe proper distance through the groove l 96 so that when "operation of tlre machine is begun the rotation of the coil form 101 draws the wire throughthe guide tube :163 from 'the supply spool 174.

therod166 to therigh't (FIG. 1) againsttheforce exerted'thereon'by a coil spring'201 which is interposed be twee'na 'colla'r 202 iix'edly mounted on -the rod 166 and the upright 124. As shown in FIG. ljthe Icam 204vis s'embly 2tl'3 whichisdriven from the drive shaft145.

Sin cethe reduction gear assembly203 and thecollets 127 and-1'32 are driven froma common motor207, the cam 204 and the 'coilform rotate in synchronism although at diiferent rates. t

Inasmuch as the four coils 110, 111, 112, and:113f:have .2 diiierent inductance values "and are spaced apart by different amounts, the cam- 240 com'p'rises' a plurality of different "sectors which respectively determine 'theipitches of the coils atthe' various positions along" the' coil form. "For example,'the first sectorwhich has the edge portion 3204a is very'steep and its purpose isto lead the wire 'from the groove 196 over the solder lug of the firstterminal 1'09. The second'sector which has the edgeiportion 2041) is "less steep andcausesthe winding of one turn between the termihals'109 and108. Ina similar manner, the remaining-sectors of the 021m 204 control the-winding "of the remaining coils and connections between the termina'ls 'I021'07, inclusive.

Although the inductance units for each of the twelve channels are'different, they may all be rnade-on the machine 120 byreplacing the cam J204 with one having theprop'er shape to wind coils'having the proper-in- 'ductance value.

Since there are twelveV'HF channelsat the present time, twelve differently shaped cams"204 are required'for winding the'required number of ditferent multiple inductance units.

Upon completion of the winding operation, 'itais important that the coil form he stopped with the solder lugs102a-109a, inclusive," on thebottom so the wire-to terminal connections may be immersed in solder 'to pro vide the necessary low ohmic'con nections. -At other-times during the overall assembly operation the solder'iugs should be on top. Therefore, in order to selectively stop the coil form in either of these positions, there is pro- "vided 'in accordancewith a feature of the present inven- 6 tion a solenoid operated brake '209, best shown in FIGS. 7 and 8, which is operated at the time that the motor 207 is deenergized to selectively engage the spokes 146a or 14'6b ofithe pulley 146 and thereby precisely stop the coil form in the desired position.

F The brake .209 includesan arm 210 which is pivotally mounted on the bed of the machine, and a block assembly 211 is fixedly mounted on the end of the .arm 210 for engaging the spokes 146a and 146b. Preferably, the block assembly is formed .of nylon to minimize bouncing of the pulley 146 when thebra'keiis applied.

Referring to FIG. 2, operation of the arm 21!) is controlled by .a connecting rod 212 which is connected to the core 215 of a pusherstypesolenoid 216 located at the right-hand side of :the machine and which is pivotally attached to the arm 210 by'means of ;a connector 221. Adjustment of the stroke ofthe arm 210 isenabled :bydhe threaded 'connectionbetween the connector 221 and the end 220 of :the .rod 212. The brake arm 210 is biased out of interlocking engagement with the :pulley 146 by means of a coil spring 217, which is located in proximity to the solenoid 216, whereby 'the brake is operated :by energizing the solenoid 216 andreleased by deenergizing the solenoid. As more'zfully described in connection with FIG 25 themotor 207 is controlled byswitching contacts onthe solenoid 216 so that when the solenoid'is 'deenergized'rto release the :brake 209 the :motor 207 is energized to :rotate the coil form. The mannerin which the energizationcircuitsof the solenoid 216 and of the .motor 207are .controlled are also described more 'fully hereinafter in connection with FIG. 25.

At the completion of the winding operation the control rod'166:of the wire feediassembly 1160 has-moverhtoithe righthand position shownin-phantom inFIG. 10 andga collar *230 whichisrfixedlymounted thereon operates :a limit switchf231 to energize the solenoid '216,'todeenergizethe motor 207, and to begin the-soldering. operation wherein the portions of the wire which are disposed Within the bifurcated ends of the terminals on thecoil formas 'shown'in.FIG..20. are soldered to the solder lugs ofthe terminals'in a dip-soldering operation. 'In'order to make these solder connections, .a solder pot .232 is e'levate'dwas shownrin FIG. '211to a positionwherein-the connections between the terminals and the wire are-immersed in'the solder. Thereafter,1the :solder pot .232tis lowered out of engagement with the terminals and a sufiicient time delay is .provided toinsure that'thesolder has solidified: before. the next operation. hasscommenced.

Referring now particularly toFIGS. 3,. 5,. and 6, the solder ipot 232 comprises a generally rectangular vessel 233 andtacover .235, The vessel has a'theating element, .such'as a "sheathed electricalheating element 23.4, embedded in the bottom thereof, :and the;cover 1235 has an "elongated slot 236 extending along one of its sides and a plurality of. apertures 2311238, 239, 240, .241, .andy242 *disposed directlybeneath the location ofthe terminal members to be soldered. Accordinfglygwhen ,the:solder pot is elevated, the terminals .on the coil form dependinto the-apertures 237, 238, 239, 240, T241, and. 242, respec- :tively, andithe solder connections are made.

In orderto elevate the solder-pot at the completion-of ?the winding operation,-"a cami245'is mounted :on agdrive shaft 246 which is connected byya suitable coupling lmechanisml247 to a rnotorL248, arid inasmuch as a cam 1follower250 is directly connected to. thesolderzpot 232,

Considered ingreater detail, the cam follower 250.,is

"a threaded studwhich is connected, as best shown in FIG. -4, :to avsoldert pot support 252 on'whichthe vessel 233 rests. wAnliinsulating bracket assembly .253 securesnthe "vessel 233 to the supporti252. Sinoethe exposed surface of thdhe'ated solder reacts with 'the ambientair to form lasurface oxide which is detrimental to. a.1good solder connection, there is provided in accordance with the present invention means for scraping the oxidized layer from the surface of the molten solder each time that the pot is elevated. This scraping of the surface of the molten solder is accomplished by means of a scraper bar 260 which rests upon the cover 235 and is pulled back across a pair of linkages 261 and 262 which are fixedly attached at their upper ends to respective ends of the bar 260 and which are pivotally attached at their lower ends to an upright supporting member 264 which is mounted on the bed 122 and extends parallel to the front of the machine. Therefore, as the solder pot 232 is elevated, the vertical force which is exerted on the bar 260 by the cover plate 235 causes it to pivot counterclockwise about the pivotal axis of the linkages 261 and 262 and thus travel rearwardly across the top face of the cover 235. As shown best in FIG, 5, the linkages 261 and 262 each comprise two parts fixedly connected together by a pair of bolts 263 to enable adjustment of the lengths of the linkages to compensate for variations in the dimensions of the associated parts.

Referring to FIG. 4, the lower edge of the scraper bar 260 has an elongated, shallow recess 282 provided therein so that only the ends of the bar 260 physically engage the solder pot cover 235. However, there is a positive meniscus on the surface of the solder and, therefore, the surface of the solder is slightly higher than the top surface of the cover and as the bar 260 moves across the core the solder is engaged by the bottom of the recess 282 to remove any oxide or other foreign matter which may be floating thereon.

In order to keep the solder pot 232 in an upright position at all times, the solder pot support 252 is attached to the upright 264 by means of a pair of H-shaped linkage members 266 and 267 which are each pivotally attached at one end to the upright 264 and at the other end to the solder pot support 252. The spacing between the connections on the support 252 is equal to the spacing between the connections on the upright 264 thereby to maintain the linkage members 266 and 267 parallel which thus guide the solder pot support 252 in a vertical plane as it is elevated by the cam 245.

In accordance with another feature of the present invention, a pair of limit switches 270 and 271, which control the solder pot lift motor 248, are mounted on the upright 123 and are respectively operated by a pair of lever arms 274 and 275 which are pivotally supported on the upright 264 by a pair of screws 274a and 275a and connected to the linkages 266 and 267 by a pair of bolts 279 and 280. Adjustment is provided by a pair of slots 277 and 278 provided in the ends of the lever arms 274 and 275 through which the bolts 279 and 280 extend. Consequently, as the solder pot is elevated from the position shown in FIG. 5, the arms 274 and 275 are rotated in a counterclockwise direction about the screws 274a and 275a which initially releases the switch 270 and later operates the switch 271.

Referring now to FIG. 5, in order to maintain a predetermined level of solder in the vessel 233, there is provided in accordance with the present invention a solder feed mechanism which is responsive to the level of solder in the solder pot 232 to feed solder to the pot during the soldering operation. This mechanism comprises a curved feed tube 290 through which a strip of solder 291 is controllably supplied to the solder pot from a suitable supply of solder (not shown). The solder strip 291 coming from the supply first passes over an idler pulley 292 and then passes between a drive roller 293 and a pinch roller 294 before entering the tube 290. As shown, the pinch roller 294 is journaled in an arm 295 which is pivotally attached to a bracket 297 and biased by means of a fiat spring 296 toward the drive roller 293 so that as the roller 293 is rotated in a counterclockwise direction the solder strip 291 is fed into the guide tube 290 and out the depending end thereof into the solder 8 pot 232 through the elongated recess 236 provided in the cover plate 235.

The drive roller 293 as best shown in FIG. 2 is driven by a motor 298 which, as more fully described hereinafter, is controlled by means of a conductive probe 299 which is suitably mounted on the upright 264 by an insulating spacer 300 and has an off-turned, depending end 301 which is disposed directly above the slot 236 in the solder pot. The height of the probe 299 is adjusted so that with the solder pot 232 in the elevated position, as shown in FIG. 21, the solder strip 291 is supplied to the solder pot until the probe 299 contacts the solder. If the level of solder is below the tip of the probe, the motor 298 is energized and solder is fed .to the solder pot.

After the solder pot has been elevated to the soldering position and the solder has flowed onto the connections between the coils and the terminals, the solder pot is lowered to the position shown in FIG. 4, the brake solenoid 216 is momentarily deenergized and the motor 207 is momentarily energized to rotate the coil form through degrees whereby the solder lug portions of the terminals are rotated to the top position. A guillotine mechanism 310 comprising a plurality of knives 311, 312, 313, 314, 315, 316, and 317 is then lowered into a wire engaging position as shown in FIG. 22 to sever from the terminals those portions of the wire which should not be present in the completed multiple inductance unit. For example, the knife 311 severs the wire to the left (as viewed in FIG. 20) of the end terminal 109, and since seven such cuts are required the knives 311-317 are eight in number.

The knives 311-317, inclusive, are adjustably mounted in a support block 320, as best shown in FIGS. 17 and 18, which is slidably supported on a swing or pendulum support 324 and attached to a drive rod 321 which extends through a suitable aperture in a flange 323 on the support 324. The block 320 is moved up and down along the support 324 by axial movement of the rod 321, and a coil spring 332, which is interposed between the flange 323 and a cotter pin 333 in the end of the rod 321 biases the block 320 in a retracted position. The swing support 324 hangs from a guillotine drive shaft 325 which is journaled at its end in the uprights 123 and 124 and is driven by a drive motor 326 which is connected to the shaft 325 by a chain and sprocket assembly 327. A cam 331 which is mounted on the shaft 325 selectively forces the rod 321 against the force of the spring 332 to lower the block 320 at the proper time to cut the wire.

Referring to FIG. 3, the chain and sprocket assembly 327 comprises a drive sprocket 328 which is directly connected to the drive shaft of the motor 326, and in order to controllably swing the support 324 forward to a position where the knives 311-317 are directly above the coil form, an arm 340 is connected at one end to the sprocket 328 by means of a pintle 341 and is connected at its other end to the support 324 by a pintle 343. Consequently, as the sprocket 341 rotates, the support pivots forward under the force of a flat spring 350, which is attached to the support 324 and bears against the rear edge of the plate 125, against an adjustable stop 351 mounted on the upright 123. The cam 331 is so positioned on the shaft 325 that after the support 324 has been lowered the rod 321 is then depressed to move the knives 311-317 through the cutting stroke.

The coil forms are, at present, quite brittle and might be broken by the shear stress exerted thereon by the knives 311-317, and in order to prevent this, a shelf 344 is attached to the bottom of the swing support 324 for supporting the coil form throughout its length during the cutting operation. Since even a slight bending of a coil form might crack it, it is important that the shelf actually engage the coil form before the knives 311317 engage the wire, and therefore, in accordance with one aspect of the present invention the swing support 324 initially swings forward to position the shelf 344 beneath the coil N I port 324 is theh elevated to lift shelf 344 into ehgagihe'ht with the terminals of the chil form. Tothis end a pair of arms 3242i and 324b on the suppti rt324 are suitably jourtialed bit a pair ofcams an 348, bes s own in Bros. 4 the 12, which are secured to the drive shaft 325 and which elevate the sup: pert 324 after it has beeii swung ihto the ttst'wnd posin- A pstmo a sm s t i provided by 'slot 349 o pe rimit the 347 and 348 to elevate gram bf the control circuit of'the machine 120-, with power appliejdfacross the input terminals 40mm 401 ['(FIG. 25) arid the main power switch closed, the brake selendid 216 isdeeherg'ized by momentarily depressin and thus openiiig a'normally closed start, switch 404which issei'ifally co nnectetllinthe energization circuit of the solenoid 216. As shown, the solenoid 216 is ener gized with the switch 404 in the released position through 'a circuit heginhing at the power terminal 400 lfifi COh'tinui'ng through a j'set of normally closed contacts 406 on a cl'elaytimer 40 7, tart-man a set of normally closed contacts on a limit switch 409 which is actuate-d by a collar 410611 the Wire feed assemblydrive rod 1f66 when the is in the extreme left-hand position,

through the switch 404 to on side at the splenbia and them thejother side of the "solenoid to the main power switchj402 which is connected to the other power terminal 401. Therefore, before ajcyclc o foperationds comr'nenced by depressing the "start buttonfitl t, the solenoid 216 is energized which maintains the brake arm 210 in ngagement with the pulley 11:46 to prevent its rotation. However, when the switch 404 is depressed, the sol'eri'oid .216 is released and the return ispring thereon releases the brake so that t he pulley 146 may ber-ota tcdr Also, when the sole rioid 216 is released a "set of normally closed contacts412which it controls are closed to complete the energization circuitfor thehr'n'ain drive m'dtor 207, Acpqr ldingly, the coil form is "rotated by the collets 127 and 132 afr'ld at the same time the' carh 204*is rotated to push the wire feed 'driverod "1 6 6 to the"rightagaiiist 201. This int-eves thecollar 410 {awa irorm-the limit switch 409 so at the "normally been contacts 408 thereof open and these coiitacts are Seiially conr'iec'te-d in the ehergizatioin l'circ ulit for the solerioid 216 the solenoid 2'16 "refrnainsfdeenergizedeven though the actuating buttbn of the "switch404 is released. The windiiig operation thu's continues until the tsunam -enga es apart o'f gan'ged arth iaires 2114 and 211's of the liinit switch 231 thereby close two sets of normally closed'contacts 416 and 417,

"respectively. Closure bf-the contacts 416 bompletesan energization circuit fora motor 418 of a solder timer 419 hich includes ajcain 420 cdntrols a set of 'norally "c'lbsed'ontacts '421taiid a set hf horrnally"open 248. This latter cnergization circuit includes a set of normally closed' con'tacts 424 in the upper'limit switch 270 and the barman-y closed contacts 421 in the toner timer 419. Accordingly, the cam 245 is rotated aiid elevates the solder pot 232 so as to immerse the solder lugs in the solder in the manner discussed hereinbeforc. Asthe pot 232 is elevated, a set of normally opeii contacts 426 in the lower limit switch 271 close to partially complete an energizatio'n circuit for the delay timer 407, and also to partially complete an alternate energization circuit for the solder pot lift motor 248. The remainder of these circuits comprises the contacts 422 of the solder timer 419. At the upper extreme of its travel the pot 232 opens *a set 'of contacts 424 in the limit switch 270 to dee'nergize the motor 248 and stop the solder pot 232 in the elevated position.

A predetermined time after the solder timer 419 has been energized, which time is suflicient to insure that the solder has properly wetted the connections and that the sol'derpot 232 has been again filled with solder, the cam 420 opens the contacts 421 and closes the contacts 422. Closure of the contacts 422 whicharc serially connected with the normally open contacts 426 in the energization circuit of the motor 248 again energizes the motor 248 and at the same time completes an energization circuit for the delay timer 407. The lift motor 248 thus operates and the cam 245 permits the solder pot 232 to fall under the force of gravity to the bottom position Where it opens the contacts 426 and deener-gizes the motor 248. Although the switch contacts 424 in the upper limit switch 270 are closed at this time, the motor 248 is not energized through that circuit inasmuch as the contacts "421 on the solder timer 419 are now open.

During the winding operation and prior to the actuation of the limit switch 231 by the collar 230 on the drive rod 166, a boss 430 on the face of the cam 204, see FIG. 9, operates a limit switch 431 to close a set of normally open contacts 432 thereof and thereby energize the guillotine drive motor 326. Rotation of the shaft of the motor 326 in addition to causing the guillotine mechanism to move toward the coil 'forr'n rotates a switch actuating "cam 433, see FIG. 5, which operates a switch'434 to close-a set of "normally open contacts 435 thereof. The contacts 435 are connected in parallel with the contacts 432 and thus comprise holding contacts which maintain the motor 326 energized until it has completed one revolution. Therefore, while the solder pot 232 is being lowered, and shortly after it has been moved out of engagement with "the terminals on the coil form, the guillotine support 324 is swuhg 'forward into the coilform eng'agingposition and the knives 311-317, inclusive, are depressed to sever the wire on the coil form. As shown in FIG. 22, the knives move in close proximity to the terminals to insure a good cutand where a section of wire is to be removed, as for example, between the terminals 103 and 104, two cuts are made, one at each terminal. Accordingly, when the coil form is removed from the coll'ets 127 and 132, the unwanted piece of wire falls from the coil form. Thereafter the continued rotation of the guillotine motor 326 lifts the knives and swings the guillotine mechanism out of engagement with the coil form. However, 'prior to the movement of the guillotine into a cutting position and after-the solder pot 232 has moved out of engagement with the coil form, the timer 407 opens the contacts 406'thereby to deenergize the solenoid 216 and to energize the motor 206 for a brief time suflicient for the coil' form't'o be rotated through degrees.

After the unwanted connections on the coil form have been severed by the guillotine, and'the solder 'pot232 has been lowered to the bottom position, the delay timer 407 opens the contacts 406 to dcenergize the solenoid 216 and to energize the drive motor 207. The cam 204 then completes its cycle of operation. Asit rotates, a steep rise portion 204a pushes the rod '166'to the right thereby to move the wire which extends from the wire feed tube'163 tothe" terminal102 against a cutter blade445, shown best 'in FIG. 5, to sever the wire. The cutter-445 is mounted on the upright 135 and is positioned so that as the wire feed guide 163 moves to the right under the control of the drive rod 166, the end of the tube 163 moves in very close proximity to the edge of the cutter 445, as shown in FIG. 23, thereby to cut the wire without bending it so that at the beginning of the next operation when the wire feed mechanism 179 is operated, the wire feeds nicely into the slot 196 in the headstock collet 127. The cam 204 thus continues to operate until it returns to the initial position, as shown in FIG. 25, wherein the normally closed contacts 408 in the limit switch 469 are closed, thereby to energize the solenoid 216 and deenergize the motor 207.

In order to maintain the level of solder in the solder pot 232 at a predetermined level, there is provided in accordance with the present invention a solder feed mechanism control circuit which operates when the solder pot is in the elevated position to detect the level of solder in the pot and to supply enough solder to the pot to bring the level up to the desired height. In this circuit the solder pot, which is formed of a good conductor, is connected by means of a conductor 450 to one side of the operating coil of a relay 451, the other side of the operating coil being connected through the secondary winding of power transformer 452 to the probe 299. Accordingly, when the solder pot is in an elevated position and the probe 299 engages the solder, an energization circuit for the relay 451 is completed and a set of normally closed contacts 454 thereof are opened. The contacts 454 are serially connected with the primary winding of the transformer 452 and a set of normally open contacts 455 on a limit switch 456, which, if desired may be included in the limit switch 270 instead of being provided in a separate switch, are closed to complete an energization circuit for the solder feed motor 298. When, therefore, the solder pot 232 is in an elevated position and the contacts 455 are closed, the solder feed motor 298 is energized to feed solder to the solder pot 232 until the probe 299 engages the solder thereby to energize the relay 451 and open the contacts 454 to deenergize the motor 298.

There is thus provided in accordance with the present invention semiautomatic assembly apparatus for manufacturing multiple inductance units of the type suitable for use in turret tuners of the type described hereinbefore.

Coil forms having terminals previously afiixed thereto are p merely placed in the headstock and tailstock collets 127 and 132 and the start button 404 is depressed at the proper times to automatically and completely assemble the unit.

While the particular embodiments of the invention have been shown, it will be understood, of course, that it is not desired that the invention be limited thereto since modifications may be made, and it is, therefore, contemplated by the appended claims to cover any such modifications as fall within the true spirit and scope of the invention.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

1. Apparatus for manufacturing multiple inductance units of the type comprising a coil form having a plurality of terminals in spaced apart relationship thereon and a plurality of coils wound on said form and connected between predetermined ones of said terminals, said apparatus comprising support means for supporting said coil form, drive means for rotating said coil form, a wire feed mechanism for supplying wire to said coil form, means for moving said feed mechanism parallel to the axis of rotation of said coil form simultaneously with the rotation of said form, a solder pot having an open top, said pot being mounted below said coil form, means operative upon completion of the winding of said wire on said coil form for elevating said pot so that solder contained in said pot engages said terminals and the adjacent portions of the wire, means for then lowering said pot to move said solder out of engagement with said terminals, and wire removal means movable into engagement with selected portions of the wire wound on said coil form after said pot has been lowered to remove undesired wire connections from said units.

2. Apparatus as set forth in claim 1 which further includes means operative when said pot is lowered for rotating said coil form one half turn, and said wire removal means is mounted above said coil form and lowered into engagement with said wire.

3. Apparatus as set forth in claim 1 wherein said support means comprises a pair of collets for engaging the ends of said coil form and means for resiliently biasing said collets toward one another.

4. Apparatus as set forth in claim 2 wherein said wire removal means comprises a guillotine mechanism including a plurality of knives which are pressed into engagement with selected portions of the wire wound on said coil form.

5. Apparatus as set forth in claim 4 wherein said knives engage said wire in proximity to said terminals.

6. Apparatus for manufacturing multiple inductance units of the type comprising a coil form having a plurality of terminals in spaced apart relationship thereon and a plurality of coils wound on said form and connected between predetermined ones of said terminals, said apparatus comprising support means for supporting said coil form from the ends thereof, drive means for rotating said coil form about a longitudinal axis thereof, a wire feed mechanism for supplying wire to said coil form under tension, means for moving said feed mechanism parallel to the axis of rotation of said coil form simultaneously with the rotation thereof, a solder pot having an open top, said pot being mounted below said coil form, means operative upon completion of the winding of said wire on said coil form for elevating said pot so that solder contained therein engages said terminals and the adjacent portions of the wire, means for lowering said pot to move said solder out of engagement with said terminals, wire removal means movable into engagement with selected portions of the wire wound on said coil form after said pot has been lowered to remove undesired wire connections from said units, and means for severing the wire connection between said wire feed mechanism and said coil form.

7. In assembly apparatus in which a plurality of coils are wound with a single wire on a coil form and selectively connected to a plurality of terminals mounted on said coil form, a guillotine comprising a support, support means from which said support is pivotally suspended, a guide member slidably mounted on said support for guided movement perpendicular to the longitudinal axis of said shaft, cutting means mounted on said guide member, drive means for swinging said cutting means to a position above said coil form and for then depressing said cutting means into engagement with the wire wound on said coil form, and a shelf mounted on said support for movement beneath :said coil form when said cutting means is swung to the position above said coil form, and means operable before said cutting means engages said wire for elevating said shelf into effective engagement with the bottom of said coil form.

8. A guillotine as set forth in claim 7 wherein said support means comprises a rotatable cam which engages said support to elevate said shelf into engagement with said coil form.

9. A guillotine as set forth in claim 7 wherein said support means comprises a drive shaft, and cam means is secured to said shaft for selectively depressing said cutting means.

10. Apparatus for winding a plurality of coils on a coil form which includes a plurality of terminals thereon, comprising means for winding a length of wire on said coil form to provide a plurality of coils interconnected between respective ones of said terminals, a solder pot for containing a supply of solder in which said terminals and the connecting portions of said wire are immersed for soldering, means for elevating said pot so that solder contained therein engages said .terniir'ial s and the adji portions of the wire, aiic'lfrnejaii's for maintaining lat fi ed 'q'dantity of solder insaid pot, said j l P firidly t l d "s i amnesia li ear with en game; any. wh determinedlevel,.. an I n s olid str'ipof solder to said pm uritil e1 said solder in d probe" eiigags 11 Apparatus f or manufalctiiring iini ibi inane are units, comprisingmeansltfortwinding apiece of wireon a single coil form into ,a manager disposed coils, means operative upon comple tion of said winding for soldering th'e ends ofsaid coils ttoterminals on said coil form, d m a s Operative wen; ii 'si dsr h s. d fi it for severing portions of said wire betweenseleted ones 13. Coil Wmdiagappn usaS se tdi orth a claim 1'1 wherein said soldering means isurnounted o n one sideyof said coil form, said severing means is,rr'1ounted on the opposite side of said coil form,fland saidcoil form is -inverted vbetween the soldering operation and the severing operation.

14. Coil winding apparatus, for

Winding a single, variable pitch coil on a coil form, means for connecting intermediate portions ofsaid coil to terminal members on said coil form, and means-for removing portions'of said coil disposed between selected ones of said terminals on the coil form, thereby to provide a y plurality of: separate coil units disposed along the le r'fgth of said coil form. a

Coil winding apparatusas set forth inclaim 14 wherein said connecting means includes a soldering mech- .y .t r a ls after the sol r anism for soldering said lntermediate portions of said c011 a i u gw 9 F 5 ta 5 s "iv-vi Said terminal mmfibers and said rcmovm means 4O has solidified, thereby to provide separate inductance coils prises a cutting mechanisnifor severing the wire at two places between said selected oii'e'sof said terminals 16. Apparatus for manufacturing multiple inductance units'of the type comprising "a coilforin 'lia'virig a brainity of terminalsin spaced apart"relationship tlierefonfand a plurality or coils wanna on said form an connected between predetermined ones of said terminals, said. apparatus comprising means to; "supporting is aid ctfil form and winding a single thereon, solder c aining means means operative afterlc ornpletion of the of said coil on said coil form for causing relatiyen ioveinent between said coil form and said solder containing niearis so that solder contained therein engages said terminals and the adjacent portions oi said coil, means for causing relative movementbetweensaidcoil form 'and said solder conta ning means to .move said solder outof engagement w th sa d terminals, andwire removal nieansfor r'emov- .i ng selected portions of the wire wound on ai 'eeirrbrm,

thereby to provide electrically separate coils on said coil 17. Apparatus for manufacturihglrriultiple inductance units of the type comprising a coil forrnfhavingaplurality of terminals mounted thereon in'spaced apart relationship and a plurality of coils wound on said form and connected between predetermined one s o f said terminals, said apparatus comprisingmans forstip orting said coil form and winding a single coil thereon with i-aortiiiswf said coil positioned on said terrninals, a solder'potfr'neans operative after completion of the winding of said coil on said coil form for causing irelativejrnovement between said coil form and said solder pot sothat solder contained therein engages said terminals and the adjacent ment between said coilfor m and "said solder pot to move in 2b betweeii selectedroii's of ermiri'als at r the sold er Has sdliiiiiied; thereby to nevi-dz separate i'rid'iic'tancefl'cbils oii jsai'd coil forr'r i. mam-areas fo traits o are t pe, coin d mea for re'mov g por i ns rid on said fc'oil form by severing the wire un s offlthetype comprising'a jcoiltorrnhaving a plurality portions of the wire wound on said coil form b y severing the wire adjacent th notched end portions of selected fiesof said terminals after the solder has solidified, there- .by to provide separate inductance coils on said coil form. a

21 "Apparatus for inanufact uring multiple inductance l o' j h we Qlnp s g a oi Qr n ha n a l ai i v 'of 'r'rninals"e'itending transversely through said c'oil'fo'rr'n a spaced apart'r'elation and a plurality er coils anna ion'fsaid formfand connected between predetermined ones said terminals, said fapparatus comprising means for supporting said c'o ilf form and winding a single coil therewith portions of said coil in engagementwith different onesiof said terminals, solderuco'ntaining means, [means fdper ative upfoncompletion of the windingof said coil fdn said ,coiliorm for cajus'irig relative movement between saidfsolder 'containingmeans'and said coil form that solder contained therein engages said terminals and the adjacent portions of said coil, and means for pressing a plurality of knives into engagement with selected portions of the wire wound on said coil form to sever the same after the solder has solidified, thereby to provide separate inductance coils on said coil form.

22. Apparatus for manufacturing multiple inductance coil units, comprising means for winding a piece of wire on an elongated coil form having terminals extending therethrough and spaced along the length thereof in such manner as to provide a plurality of inductance coils the end turns of which are wound over portions of predetermined ones of said terminals, said inductance coils being connected together by an intervening portion of said wire, means operative upon the completion of the winding of said coils for simultaneously conductively bonding the ends of said coils to said portions of said terminals by immersing the same in molten solder, and means operative after the solder has solidified for simultaneously severing said intervening portion of said wire, thereby to provide electrically separate coils on said coil form.

23. Apparatus for manufacturing multiple inductance coil units, comprising means for winding a piece of wire around an elongated coil form having spaced terminals provided with wire receiving end portions projecting from one side thereof in such manner as to provide a plurality of inductance coils spaced along the length of said coil form and connected by an intervening portion of said wire, said winding means being arranged to provide a winding pitch in the vicinity of predetermined ones of said terminals such that said wire lays in said wire receiving end portions of said predetermined ones of said terminals as said coils are wound on said coil form, means operative after said coils have been wound on said coil form for soldering the ends of said coils to said terminals, and means operative after the solder has solidified for severing said intervening portion of said wire, thereby to provide electrically separate coils on said coil form.

24. Apparatus for manufacturing multiple inductance coil units, comprising means for winding a piece of wire around an elongated coil form in such manner as to provide a plurality of inductance coils displaced along the axis of said coil form and conected by an intervening portion of said wire, said coil form having terminal members thereon which are provided with contact engaging surfaces projecting beyond one side of said coil form and wire receiving end portions projecting from another side of said coil form, said winding means being arranged to provide a winding pitch in the vicinity of predetermined ones of said terminals such that said wire lays in said wire receiving end portions and is positioned beside said contact engaging surfaces of said predetermined terminals as said coils are wound on said coil form, means operative after said coils have been wound on said coil form for soldering the ends of said coils to said wire receiving end portions of said terminals, and means operative after the solder has solidified for severing said intervening portion of said wire, thereby to provide electrically separate coils on said coil form.

'. Apparatus for manufacturing multiple inductance units of the type comprising a coil form having a plurality of terminals in spaced apart relationship thereon and a plurality of coils wound on said form and connected between predetermined ones of said terminals, said. apparatus comprising support means for supporting said coil form, a wire feed mechanism for supplying wire to said coil form, drive means for producing relative rotation between said coil form and said wire feed mechanism, means for producing relative movement between said coil form and said wire feed mechanism in .a direction generally parallel to the longitudinal axis of said coil form and simultaneously with said relative rotation, .a source of molten solder, means operative after completion of the winding of said wire on said coil form for causing relative movement between said coil form and said solder source so that solder engages said terminals and the adjacent portions of the wire, means for causing relative movement between said coil form and said solder source to move said terminals out of engagement therewith, and wire removal means movable into engagement with selected portions of the wire wound on said coil for-m after the solder has solidified to remove undesired wire connections from said unit.

26. Apparatus for manufacturing multiple inductance units of the type comprising a solid elongated coil form having a plurality of conductive terminals spaced along the length of said coil form and a plurality of coils wound on said form and connected between predetermined ones of said terminals, said apparatus comprising means for winding a plurality of coils around said coil form with the end portions thereof in engagement with certain ones of said terminals, a source of molten solder, means operative after the completion of the Winding of said coils on said coil form for causing relative movement between said coil form and said solder source so that solder therefrom is deposited on said terminals and the adjacent end portions of said coils, means for causing relative movement between said coil form and said solder source to move said terminals out of engagement therewith, and wire removal means operative after the solder has solidified and movable into engagement with said end portions at points adjacent said certain terminals to remove undesired wire connections from said unit.

27. Apparatus as set forth in claim 25, wherein said wire removal means includes a plurality of knives which are pressed into engagement with said selected wire portions.

28. Apparatus as set forth in claim 26, wherein said wire removal means includes a plurality of knives which are simultaneously pressed into engagement with said end portions.

29. Apparatus for manufacturing multiple inductance units of the type comprising a solid, elongated coil form having a plurality of conductive terminals extending transversely with respect to said coil form with wire receiving end portions projecting from one side of said coil form and a plurality of coils Wound on said coil form and connected between predetermined ones of said terminals, said apparatus comprising means for winding a plurality of coils around said coil form with the end portions thereof positioned within said wire receiving end portions of certain ones of said terminals, a source of molten solder, means operative after completion of the winding of said coils on said coil form for causing relative movement between said coil form and said solder source so that solder therefrom is deposited on said terminals and the adjacent end portions of said coils, means for causing relative move ment between said coil form and said solder source to move said terminals out of engagement therewith, and Wire removal means operative after the solder has solidified and movable into engagement with said end portions at points adjacent said certain terminals to remove undesired wire connections from said unit.

30. Apparatus as set forth in claim 29 wherein said wire receiving end portions of said terminals are provided with notches the bottom edge of which is spaced from the adjacent surface of said coil form and said plurality of coils are wound around said coil form with the end portions thereof positioned within said notches and spaced from the adjacent surface of said coil form.

References Cited by the Examiner UNITED STATES PATENTS 1,807,199 5/1931 Dear 92.2 1,910,687 5/1933 Freeburg 1402 1,947,689 2/1934 Young l40-92.2 2,030,988 2/1936 Hofstetter 140-922 2,154,792 4/1939 Weber 14092.2 2,371,780 3/1945 Sirp 140-715 (Other references on following page) 17 UNITED STATES PATENTS Wah-l 140-71 Leland 140-92.2 Bur-ge et al. 140-92.2 Anderson 228-8 Gartne'r et a1 140-71.5 Steger 140-92.2 Scharf 228-5 McWilliams 228-8 Kuba et a1. 14O71.5 Buffington 228-12 Park 140-922 Fuller 140-71 Fryk'lund 140-71 CHARLES W. LANHAM, Primary Examiner. W. H. JUST, Assistant Examiner. 

1. APPARATUS FOR MANUFACTURING MULTIPLE INDUCTANCE UNITS OF THE TYPE COMPRISING A COIL FORM HAVING A PLURALITY OF TERMINALS IN SPACED APART RELATIONSHIP THEREON AND A PLURALITY OF COILS WOUND ON SAID FORM AND CONNECTED BETWEEN PREDETERMINED ONES OF SAID TERMINALS, AND APPARATUS COMPRISING SUPPORT MEANS FOR SUPPORTING SAID COIL FORM, DRIVE MEANS FOR ROTATING SAID COIL FORM, A WIRE FEED MECHANISM FOR SUPPLYING WIRE TO SAID COIL FORM, MEANS FOR MOVING SAID FEED MECHANISM PARALLEL TO THE AXIS OF ROTATION OF SAID COIL FORM SIMULTANEOUSLY WITH THE ROTATION OF SAID FORM, A SOLDER POT HAVING AN OPEN TOP, SAID POT BEING MOUNTED BELOW SAID COIL FORM, MEANS OPERATIVE 